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%I
%S 1,10,94,850,8022,75830,717388,6787364,64217998,607594090,5748711994,
%T 54391069402,514617618420,4869021638192,46067936415154,
%U 435868830209930,4123945024124830,39018441749664142,369170487886312636
%N Number of base 10 circular n-digit numbers with adjacent digits differing by 7 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
%F G.f.: (1 - 3*x^2 - 40*x^3 + 3*x^4 + 24*x^5) / ((1 - x - x^2)*(1 - 9*x - 5*x^2 + 6*x^3)) (conjectured). - _Colin Barker_, Jun 01 2017
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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